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Li-Ion Accumulators – Comparison Of Cathode Materials
Lexová, Kristýna
The issue of energy storage becomes increasingly important with the growing need for safe and clean energy that could be used in portable electronics and electric vehicles. This paper shortly introduces the topic of lithium-ion accumulators, compares currently used cathode materials and discusses promising future materials.
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Influence Of Ambient Temperature On Electrochemical Parameters Of Lithium-Sulfur Batteries
Jaššo, Kamil
With the increasing popularity of electric vehicles, the demand for their range is increasing and thus demand for the batteries that power them. Range of current electric vehicles using Li-ion battery technology is around 250 miles (400 km). In the case of use of new prospective next-gen batteries such as Lithium-sulfur (Li-S) range of the electric vehicle may be doubled or even tripled. However, there are many challenges ahead of using these batteries in electric vehicles. Since the batteries in electric vehicles are largely affected by ambient temperature, this article deals with researching the effect of ambient temperature on lithium-sulfur batteries.
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Study of electrode materials for post-lithium ion systems
Kekelák, Miroslav ; Jaššo, Kamil (referee) ; Kazda, Tomáš (advisor)
This bachelor thesis deals with studying electrode materials for post-lithium ion systems. The theoretical part describes the principle, history and construction of lithium-ion battery cells. A separate chapter is dedicated to the materials of positive and negative electrodes for lithium-ion batteries. The third chapter is dedicated to the principles of new generation lithium-air and sodium-ion batteries. The last chapter of theoretical part is dedicated to lithium-sulfur batteries, which describes their principle, history, used electrode materials and the influence of binders. The experimental part is dedicated to the preparation of the electrode material of lithium-sulfur accumulator in combination with water-soluble binders and their measurement using electrochemical methods.
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Effect of temperature on electrochemical parameters of Li-S battery
Bečan, Jan ; Skala, Kateřina (referee) ; Jaššo, Kamil (advisor)
This bachelor's thesis deals with the production of lithium-sulfur battery and the effect of changing temperatures on its electrochemical parameters. The theoretical part is focused on primary and secondary batteries and their historical evolution, anode and cathode materials for lithium-ion batteries and next-generation batteries. The practical part is focused on preparing the electrode material for lithium-sulfur battery, completion of electrochemical cell and measuring the values of cycling charge/discharge at different temperatures.
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Carboxymethyl Cellulose As The Binder For
The Lithium-Sulfur Batteries
Jaššo, Kamil
Demand for the high energy density batteries significantly increased along with the rapid development of new power source depending technologies. While these technologies are rapidly evolving, the battery industry is lagging behind unable to meet the demand. As a prospective successor to the existing li-ion battery technology, can be the high-capacity lithium-sulfur battery system (Li-S). The most commonly used composition of the positive electrode material of Li-S batteries is a mixture of sulfur, carbon and PVDF1 binder mixed in NMP2 solvent, which is (according to the WHO3) slightly toxic. The article deals with a replacing PVDF with organic non-toxic water-soluble binder.
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Effect of Compaction Pressure to the Electrochemical Properties of the Electrodes for Li-S Accumulators
Jaššo, Kamil
Over the last decade, demand for batteries increased a lot thanks to the wearable devices and electric cars. The current trend in all industries is reducing the size and weight of batteries and increasing their capacity. The demand for even more powerful batteries is often faced with theoretical and practical limits of the technology. Battery industry compared to other industries is just slightly behind and batteries became a limiting factor for technologies.The purpose of this experiment is to describe the impact of compaction pressure on the electrochemical properties of the positive electrode for lithium-sulfur batteries.
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Advanced systems of Li-Ion accumulators
Lexová, Kristýna ; Langerová, Petra (referee) ; Mihai, Hana (advisor)
S rostoucí potřebou energie pro přenosnou elektroniku a elektrická vozidla se problematika úschovy elektrické energie stává stále významnější. Tato bakalářská práce poskytuje přehled elektrochemických zdrojů energie, a to zejména lithno-iontových akumulátorů a nejpoužívanějších materiálů pro kladnou elektrodu. Práce pojednává také o vývoji vysokonapěťových katodových materiálů, včetně systému lithium-síra. Experimentální část této práce popisuje zhotovení několika vzorků kladných elektrod, a porovnává jejich elektrochemické vlastnosti.
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Effect of compaction pressure to the electrochemical properties of the electrodes for Li-S accumulators
Jaššo, Kamil ; Tichý, Jiří (referee) ; Kazda, Tomáš (advisor)
The purpose of this diploma thesis is to describe the impact of compaction pressure on the electrochemical parameters of lithium-sulfur batteries. Theoretical part of this thesis contains briefly described terminology and general issues of batteries and their division. Every kind of battery is provided with a closer description of a specific battery type. A separate chapter is dedicated to lithium cells, mainly lithium-ion batteries. Considering various composition of lithium-ion batteries, this chapter deeply analyzes mostly used active materials of electrodes, used electrolytes and separators. Considering that the electrochemical principle of Li-S and Li-O batteries is different to Li-ion batteries, these accumulators of new generation are included in individual subhead. In the experimental part of this thesis are described methods used to measure electrochemical parameters of Li-S batteries. Next chapter contains description of preparing individual electrodes and their composition. Rest of the experimental part of my thesis is dedicated to the description of individual experiments and achieved results.
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Lithium Sulphur Batteries
Juračka, M.
S+C cathode material was prepared by simple solid-state reaction in ball mill. Content of sulphur was approximately 80 wt. % in final sample. Cyclic voltammetry and galvanostatic charge/discharge techniques were used for characterization of the samples. Initial discharge capacity observed for S+C sample was 600 mAh/gsulfur. Capacity loss for S+C sample after 30th cycles was 66 %. Cycling loss is due to insoluble polysulfide formation. In this paper I present fundamental characteristics of Li-S batteries. This paper presents a principle of Li-S batteries, fundamental measurement and their evaluation. I present the techniques of measurement and preparation of cathode materials.
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